GARY BROWN / SCIENCE PHOTO LIBRARY GARY BROWN / SCIENCE PHOTO LIBRARY
Caricature of the British naturalist Alfred Russel Wallace (1823-1913). Wallace organised expeditions to the Amazon and Malaysia and was the first European to see orang-utans in the wild. He collected many specimens and founded the study of the geographical distribution of animals (biogeography). He formulated (independent of Charles Darwin) the theory of natural selection as a mechanism for the origin of species. He and Darwin presented their results in a joint paper in 1858 before the Linnean Society.
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